If no delay is given, pam_faildelay will use the value of FAIL_DELAY from /etc/login.defs.
Only the auth module type is provided.
The following example will set the delay on failure to 10 seconds:
auth optional pam_faildelay.so delay=10000000
pam_fail_delay(3), pam.conf(5), pam.d(5), pam(7)
pam_faildelay was written by Darren Tucker <firstname.lastname@example.org>.